The final versions of the 1.0 SDK and runtime were made publicly available around &6pm PST on15-Jan-2002. At the same time, the final version of Visual Studio.NET was made available to MSDN subscribers.
.NET 1.1 was released in APRIL2003, and was mostly bug fixes for 1.0.
.NET 2.0 was released to MSDN subscribers in late October 2005, and was OFFICIALLY launched in early November